<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        li {
            list-style-type: none;
        }
        .tab {
            width: 978px;
            margin: 20px auto;
        }
        .tab_list {
            height: 39px;
            border: 1px solid #ccc;
            background-color: #f1f1f1;
        }
        .tab_list li {
            float: left;
            height: 39px;
            line-height: 39px;
            padding: 0 20px;
            text-align: center;
            cursor: pointer;
        }
        .tab_list .current {
            background-color: #c81623;
            color: #fff;
        }
        .item_info {
            padding: 20px 0 0 20px;
        }
        .item {
            display: none;
        }
    </style>
</head>
<body>
    <div class="tab">
        <div class="tab_list">
            <ul>
                <li class="current">商品介绍</li>
                <li>规格与包装</li>
                <li>售后保障</li>
                <li>商品评价</li>
                <li>手机社区</li>
            </ul>
        </div>
        <div class="tab_con">
            <div class="item" style="display: block;">商品介绍模块内容</div>
            <div class="item" style="display: none;">规格与包装模块内容</div>
            <div class="item" style="display: none;">售后保障模块内容</div>
            <div class="item" style="display: none;">商品评价模块内容</div>
            <div class="item" style="display: none;">手机社区模块内容</div>
        </div>
    </div>
    <script>
        var list = document.querySelectorAll("li")
        var items = document.querySelectorAll(".item")
        for (var i = 0; i < list.length; i++) {
            list[i].setAttribute("index", i)
            list[i].onclick = gaibian
        }
        function gaibian() {
            //改变页签状态
            for (var i = 0; i < list.length; i++) {
                list[i].className = ""
            }
            this.className = "current"
            //显示合适内容
            for (var i = 0; i < items.length; i++) {
                items[i].style.display = "none"
            }
            var index = this.getAttribute("index")
            items[index].style.display = "block"
        }

    </script>
</body>
<html>